William Nicolas Baltz (February 5, 1860 – August 22, 1943) was a U.S. representative from Illinois.

Born in Millstadt, St. Clair County, Illinois, the son of German immigrants,[1] Baltz attended the public schools.

He was a member of the St. Clair County Board of Supervisors from 1897 to 1913, its presiding officer from 1908 to 1911.

He resumed agricultural and industrial pursuits at Millstadt until his death there on August 22, 1943.

This article incorporates public domain material from the Biographical Directory of the United States Congress